and semistabilized pyridinium ylide precursors, and aldehydes in the presence of piperidine. This one-pot transformation generates two C–C and one C–O bond and proceeds through a cascade Knoevenagel condensation, a Michael addition, and intramolecular SN2 cyclization. Formation of cyclopropanecarbonitrile derivatives, which in some cases were obtained as major products, was found to be a competing
通过β-酮腈、羰基和半稳定化的
吡啶鎓叶立德前体以及醛在
哌啶存在下的三组分反应,以非对映选择性方式合成了反式-4,5-二氢
呋喃-3-甲腈文库。这种一锅转化生成两个C-C和一个C-O键并经由级联Knoevenagel缩合,迈克尔加成,和分子内小号Ñ 2环化。发现在某些情况下作为主要产物获得的
环丙烷甲腈衍
生物的形成是一种竞争反应。芳基
乙二醛的使用会改变区域选择性并产生 2-hydroxy-2 H - pyran -5-carbonitriles。